solve the following using sum-product/product-sum identities

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- August 2nd 2012, 01:36 AMhacker804sum-product/product-sum
solve the following using sum-product/product-sum identities

- August 2nd 2012, 10:04 AMsrirahulanRe: sum-product/product-sum
In this case,

Q1,

L.H.S

=

=

=

= (Since cos90=0)

=R.H.S

Q2,

L.H.S

=

=

=

=

=

=R.H.S

Q3,

I think you mention cos180 or cos 80 I can't get any answer.

Q4,

L.H.S

=

=

=

=

=

=

=

=R.H.S - August 2nd 2012, 10:55 PMhacker804Re: sum-product/product-sumQuote:

Where did the 2 in the numerator and denominator come from??? - August 3rd 2012, 12:01 AMsrirahulanRe: sum-product/product-sum
you want to multiply by 2 to numerator and denominator,This is a way to get your answer quickly.